2 large "S" shaped crafts hovering fairly low

I was driving east on highway 70 (not far from the airport) when I noticed a strange object in the sky above me. I did a double take and saw there were 2 large gray, metal-looking crafts that were both shaped like the letter "S", like a bold, block type font. They were hovering fairly low and flying gracefully through the sky. It was raining and dreary out but I definitely saw them. I thought they might be drones but have never heard of or seen any drones like that before. They were silent and had no obvious means of propulsion. I was in my car driving by myself or I would have filmed them. It was very peculiar.